This is the bitcoin forum. We don't deal in paypal except in currency exchange reaction and even then, it must involve bitcoin.
Judging from his few past posts he is aware of that, as he appears to be doing some mining. But this sounds like something that belongs at the Silk Road.
A "genuine" transfer of software license (in a legally kosher sense) generally requires physically conveying all the media and all materials, or in the case of digital software, a signed statement transferring the license certifying that the license is genuine along with evidence of original purchase (e.g. invoice). Bottom line, one must convey evidence that the license was legally acquired from the manufacturer of the game for it to remain "genuine". Anything less is not a "genuine" transfer, and offers for "genuine" software at deep discounts that really aren't legal are a dime a dozen in my junk mail box (all pirated). Mere possession of a working serial number is not evidence of a valid license.
Fair enough, I do have the original invoice for the "bulk" buy for my keys, however I do not want to disclose that kind of information to my customer. In addition, some of the games I do have original box, however due to the shipping cost I've decide to do business with digital version - serial key only.
@Diablo : Check this out http://www.cdkeysdirect.com/
@demonofelru: Yes I do.
